McSherrystown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 17.5 °C (high). Annual precipitation averages 1119.4 Millimeters. McSherrystown is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.3 °C | 4.1 °C | 80.01 mm |
| February | -4.6 °C | 5.8 °C | 66.55 mm |
| March | -0.6 °C | 10.7 °C | 99.06 mm |
| April | 5.2 °C | 17.6 °C | 88.65 mm |
| May | 10.5 °C | 22.8 °C | 102.62 mm |
| June | 15.8 °C | 27.6 °C | 94.74 mm |
| July | 18.2 °C | 30 °C | 106.17 mm |
| August | 17.1 °C | 29 °C | 94.23 mm |
| September | 13.2 °C | 25.3 °C | 121.41 mm |
| October | 6.8 °C | 18.6 °C | 97.79 mm |
| November | 1.4 °C | 12.5 °C | 78.74 mm |
| December | -2.7 °C | 6.5 °C | 89.41 mm |
| Annual | 6.3 °C | 17.5 °C | 1119.38 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |